Electrical question - PeachParts Mercedes-Benz Forum

E150GT · #1 10-10-2007, 05:18 PM

The factory fader switch in my 420sel seems to be bad these days beacuse I get no sound from the speakers when I start the car unless I= unplug the fader switch and plug it back in. Yesterday I was driving with the radio on but no sound was produced, but when I pressed the sunroof switch to lower the sunroof,the sound went on. I have noticed that ocasionally if I use some switches like the sunroof and power seats it will make the speakers work. Does that indicate a bad fader switch or some kind of short circuit somewhere?

david s poole · #2 10-10-2007, 05:37 PM

i would try a new fader switch but it sounds like the speaker ground[s] have been compromised.they should remain above the vehicle chassis but sounds like one may have rubbed thru.this prob causes a speaker protection device to come on and who knows what the parameters for it going off are.it's poss i suppose for the bad circuit play to be happening in the fader switch.

E150GT · #3 10-10-2007, 05:54 PM

Hhmmm. Where exactly are the speaker grounds?

david s poole · #4 10-11-2007, 10:56 AM

two wires going to each speaker,one is ground ,usually the wire without the stripe on it.

E150GT · #5 10-11-2007, 12:55 PM

Thanks. I will take a look at them.